Baking-oven.



0 w. HELM.

BAKING OVEN.

APPLICATION mm mm 22. HHS.

Patented Aug. 6, 1918.

2 SHEETS-SHEET l- C W. HELM.

BAKCNG oviw.

APPLICATION FILED JUNE 22. l9lfi.

1,274,880. Patented Aug. 6, 1918.

2 SHEETS-SHEET 2- null-ll n C WELLS HELM, OF CHICAGO, ILLINOIS.

BAKING-OVEN.

Specification of Letters Patent.

Patented Aug. 6, 1918.

Application filed June 22, 1916. Serial No. 105,125.

To all whom it mag concern:

Be it known t at I, C Wnnrs Hnmvr, a

citizen of the United States, and a resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Baking-Ovens, of which the following is a full, clear, and exact description.

The invention relates to baking ovens and more particularly to the apparatus provided for illuminating the baking chamber for ins ection of the roduct no object of the invention is to provide improved lighting apparatus comprising an electric lamp which is removably disposed in the baking chamber itself and above the charging door and at a point where the product in the baking chamber will be illuminated without misleading shadows. A further object is to provide improved electric lightingapparatus for the baking chamber which can be readily and conveniently removed for the purpose of cleaning the protective lamp container in the baking chamber. Afurther object of the invention is to rovide improved lighting apparatus whic when installed in the oven, will preventthe esca of steam and heat from the baking cham r. Lastly, the invention designs to provide an improved lighting apparatus for the baking chamber 0 an oven.

In the drawings: Figure 1 is a vertical longitudinal section through the door of the baking chamber and the lighting apparatus. Fig.2 is a vertical section through one of the chambers at the sides of the charging door, showing the switch 0 erated by the char g door. Fig. 3 is a ont elevation of ti: door, parts being shown in section. Fi 4 is a sectional perspective of the lighting apparatus and its connections, separated from the oven, the switch-plug, which is removable from the oven with the lamp, being shown withdrawn from the switch-socket.

The invention is shown as applied to a baking oven com rising a structure of masonry 15 in the body of which a baking chamber 20 is formed. Since the invention relates to the lighting apparatus for the baking chamber, it has not been deemed necessary to illustrate and describe a complete oven, an exemplification of which may be found in Letters Patent No. 1,165,409 granted to me December 28, 1915.

An opening 21 is formed in the front structure 15 and extends from the baking' chamber through the front of the structure. A door-frame comprising a bottom wall 22, side walls 23, and a top wall 24 is built into the opening 21. This frame is provided with a front wall or flange 25 fitting against the front face of the struo ture 15. An inclined plate 26 extends from the lower-front portion of said frame to the bottom 20* of the baking chamber. A door 27 is provided with pintles 27 at its ends which are held so as to permit the door to be swun backwardly and upwardly for charging an inspection of the contents of the baking chamber. A plate 28 fits against the curved upper edge of the door and extends to the top wall 24 to form a closure between the door and the top wall of the frame. An opening 30 is formed in the front wall 25 of the d0or-frame to pr0- vidc access to the door 27. A counterweight 31 is secured to each pintlo 27 in such manner as to cause the door to be held open by the weights after it has been shifted to its open position and so that they will not tend to shift the door when it is in closed position, shown in Fig. 1. Each of these weights is disposed in chambers 32 formed in the door frame, the walls of the latter being extended to form these chambers adjacent the outer sides of the side walls 23 of the door frame. The fronts of these chambers 32 are open to render the weights accessible for the purpose of shifting the door.

A housing 33 is builtinto and extends through the front of structure 15, the masonry of the structure being laid around the housing. This housing is for the insertion and removal of an electric lamp 34 which is mounted in a suitable socket 35. A lampsupporting head 36 secured to said socket fits snugly in an opening 37 in the inner end of the housing 33. This head is provided with a flange 38 fitting against a shoulder 39 in the housin A glass lamp protector 40 contains the e ectric lamp 34 and is suituhly secured to the socket 35. A pipe 1.1 is ured he o ke 3.5- Thia nine 1 serves as 2t handle for removing and ropluo iug the lamp with its protector 40, socket 35, and head 36 and also serves as a holder for the flexible electric conductors l2 which a re suitably connected to the usual terminals in lamp socket 35 and to coi'iductor'tcrnii nals 'm a switcl i plug The lat'ter' 'i's adapted for connection to switch: socket 44 which is mounted 111 one side of e ho sing- 3?idjiwent its innenend, he o ing 3 is mowe a a 3?, for h nump s f gu ding he he d 36 int op nin 37 in the housing. A pipe 45 extends from the switch-socket 44 through thelnasonry of uc e. 5, o o fv hes dp wel 23 of the doorv irameend the, eleotriealoonr ducbors46 and-47 leedingto the switch et r xt nde th o gh h s n ne.

These leading-in are also .ex-

en re vre 1 A oo -e ntml dswiwh Sln d d i ond ct r 7 t t e irui flu -u h ess to be auto a i a y losed wh e t d qr -isl r od in er mp t e m il wh n t e doo (i cla se- Eo s P pose, to 47 is con-neote toe .post 48} provided h smin e i t et mem e s .9- and h th r branch is needed o a PQ MQfi-pme d th. s eeontes members. 0,-- A [gov-able switch member 51 is secured to rotate with one or the pintles of theidooir and is arranged so that when the door is open, it will electrically connect contacts 49 and 50 end when the door is closed, it will be out of contact w'th either of said contacts, as shown in Fig. Hosts 4,8 and 49, ,are mounted on a plate 510i insulating material. The front 25 of the door frame has an opening 52 in registry with the housing 33 and e'doo r 54; is a de-pted to close opening 52, being hinged ;to the front wall 25 at one side oi said opening.

It will be observed that the electric lamp. 34 is disposed above the door opening. and within the baking ohwmhe gthet is, rearward lgy of the front all Of 'the halting chamber, immediately above the door frame. In practice, it has been found that in lighting apparatus heretofore employed, the-limp was pieced in the front wall where shadows would stall JIIPQH the contents ofthe baking oven and these, at times, would mislead the baker into withdrawing the. product before or after the correct time for removal. The present invention overcomes this objection to. prior-ovens, because the lamp is disposed within the baking chamber end above the door where it will shed light eyenlyupon the contents of the-baking chamberwithout casjte bomb s te sed e bcco re coated with steam and in order to efl'ec lvely illuminate the baking-chamber,

the bulb or )rotector must be wiped off and cleaned. y withdrawing the s'witbh l from the 44; and grasping handlepipe 41, the baker can quickly withdraw the lamp and its support from the baking-cha nher for cl a ing Fa id can quickly res o e th lamp to t onemtive'nosition n the baking hambenthe t ther d portion 337 qf-the hol sing. 33 fomlitating the passage. of the head or Sum i 36 life? th amp socket 35 into. flieopeuing a t e i nier. end of the hell ing, so that a joint will be f r ed between ing and he suppol't-ixfir hich will preventfmakeuiel smne of heat from the bak g eham er-l i f. I

y Providing a innocent-re ied switolut ie lwmp will be rendered operative whenever the oven door is hi it sho ldbe dei -ed temp-the dooropeu whentheoven isnot in operetionythe circuit can be internupted by Withdrawing switoh plng 43 from The inve tionlis not tohe iunderstoodas restricted-to the details set'forth, sinoe'these may be modified within the scope oi the appended olaims withoui; departing 'from the spirit andseopeof the invention.

wvzi'ng thus described the :in ventionmhat I clairn :as newand desire ioeecu'reby. Lotters ?a'ten t, is: r

1. Ln aha-king oven, bhecombi nati of a structure having a 'balcinguehamber eroin, a door in the 'st'nuetureat' the 'front of the baking chamber, -51 housing extending? through the fnont of said structure-and having an opening at its rear end, lamprsupe porting means cemovelily held in-seid iopelning, a switdh comp'nis' ."sepa'mble members one of: remove le {mic obe/housing with the lamp and-its support and the other of which is fixed 'in the housing, and electrical conductors for the lamp connected !to the removable switch member.

2. In a baking oven, the combination oi a structure having a baking chamber therein, a door in'the structure at the front, ofthe lurkingchamber, a housing extending through-the front of said structure and haw in'g anopening at its rear end, :lamp-supporting means removably held inisaid 0 ening, a, switch comprising separithle members, one ofwhich is removnble from the housingwith the lamp and its support, -a pipe on said support and in the housing, and: electrlicel conductors for the iainp extending through said pipe and connected to said retric lamp, a lamp-support removably held movable switch-member. in the housing, and a door-operated switch 3. In a baking oven, the combination of for controlling the lamp circuit disposed at 10 a structure having a baking chamber therein, one end of the door, and a switch comprising 0' a door in the structure at the front of the separable members disposed in the housing.

' baking chamber, a housing in the front wall of the structure and above the door, an elec- C. WELLS HELM.

Copies a! thin potent may be obtained for he can each, by addressing the "commoner o! htontl.

Washington, D. 0. 

